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Genotype-Guided Warfarin Dosing in Patients With Mechanical Valves: A Randomized Controlled Trial
Zhe Xu1, Shu-Yu Zhang2, Min Huang2
1Division of Cardiac Surgery, Key Laboratory on Assisted Circulation, Ministry of Health, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
The Annals of Thoracic Surgery
|September 12, 2018
Summary
Genotype-guided warfarin dosing in East Asian patients with mechanical heart valves was safe and potentially more efficient, reducing time to a stable dose. Pharmacogenomic testing may identify high-risk individuals for improved warfarin management.
Area of Science:
- Pharmacogenomics
- Cardiovascular Medicine
- Clinical Pharmacology
Background:
- The clinical effectiveness of genotype-guided warfarin dosing is debated.
- This study aimed to assess genotype-guided warfarin dosing efficacy and safety in East Asian patients.
Purpose of the Study:
- To evaluate the efficacy and safety of genotype-guided warfarin dosing compared to clinical-guided dosing in East Asian patients with mechanical heart valves.
Main Methods:
- A double-blind, randomized controlled trial compared a genotype-guided algorithm (CYP2C9, VKORC1, CYP4F2) with a clinical-guided approach.
- Primary outcomes were time to stable warfarin dose and time in therapeutic range (TTR).
Main Results:
- The genotype-guided group reached a stable warfarin dose faster (33.5 vs. 42.1 days, p=0.009).
- Time in therapeutic range (TTR) was similar between groups (47.5% vs. 47.3%, p=0.941).
- CYP2C9 *1/*3 genotype and highly sensitive responders showed increased INR variability and risk.
Conclusions:
- Genotype-guided warfarin dosing is safe and potentially more efficient for achieving stable dosing in East Asian patients.
- Pharmacogenomic testing can identify high-risk patients (CYP2C9 *1/*3, highly sensitive responders) with mechanical heart valves.
- Further powered studies are required to confirm these findings.
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